This is pretty much standard practice now with all teams with their non-top flight starter prospects. Everyone loves the Cards and Rays and they do it too. The Cards and Rays have been doing it lately because they have a ton of talent in the rotation (Cards have Wainwright, Wacha, Miller, Lynn, Martinez, Kelly, TB has Price, Moore, Hellickson, Archer, Cobb, Odorizzi) and have no room for anyone else. Some teams, particularly TB, move veterans to make room for their top prospects. The Brewers don't seem to have any faith in their guys. They give them a shot in September but won't give them a shot in April. Like I said it's just frustrating that when the Brewers FINALLY have a pitching prospect ready they stash him in the bullpen.